Television system



May 23, 1950 R. D. KELL TELEVISION SYSTEM Filed Dec. l2, 1945 G 5 Q 4/ H V Illllllllllll I zal l V J reAMr/f/r/'i ipa/PMM? CAM/f2.4 co/vzeaL afecta/7:5

i 5 m w w i w N 0E VZ m Tm a Patented May 23, V1950 UNITED STATES PATENT OFFICE TELEVISION SYSTEM Ray D. Kell, Princeton, N. J., assignor to Radio Corporation of America, a. corporation of Dela- Waffe Application December 12, 1945, Serial No. 634,554

7 Claims. (Cl. 1785.2)

up or camera tube and Iare directed along a sin.

gle optical path. Naturally, a plurality of cameras are actually used in a studio and all may be simultaneously producing television image signals, yet the signals that are actually transmitted are generally derived from one only of the plurality of camera tubes. When the optical images are focused upon the camera tube they produce electrostatic charge images which, in turn, are converted. to video signals within the camera tube and .these signals are transmitted to a remotely located receiver Where they are employed and used to vproduce an optical light image on the screen of a television receiving tube.

In present black and white television transmis sion, the horizontal deection frequency or line frequency is of the order of 15,750 cycles per second whereas the iield or vertical deilection frequency is of the order of 60 cycles per second. Since double interlacing is usually employed, two elds are required for each complete picture or image frame. The frame frequency presently standardized is 30 per second. Each complete picture or image or frame is, therefore, composed of approximately 525 picture lines whereas each television field includes half this number or 2621/2 lines.

2 be obtained, it is necessary that, the individual eyes of the observer see only the proper images and accordingly, provisions are made at the receiver whereby each eye of the observer sees images which correspond to the light transmitted along a certain one only of the two optical light paths at the transmitter. For causing the camera tubeto respond to images directed along the two paths in succession and for causing the eyes of the observer to see only their proper images,`

light polarizing screens are employed.

' The present invention may also be used in conjunction with color television by including, at tho transmitter, a color lter assembly for separating the component colors in order that signals representative of the component colors may be transmitted sequentially. A corresponding light lter assembly is also employed at the receiver for imparting the proper color tone to the produced black and white optical image. Naturally.

y the color filter assembly at the receiver must be operated in synchronism with the corresponding assembly at the transmitter and the phase relationship of the lter assemblies must be properly adjusted.

It is, therefore, one purpose of the present invention to provide a system whereby it is possible to transmit. television images to produce a perspective or stereoscopic effect.

Another purpose of the present invention resides in the provision of a system for transmitting color television images, and, in addition, im-

In accordance with the present invention, it

lparting to these images a perspective or third dimension eiect.

Still another purpose of the present invention i resides in the provision of a system for transmitting images in perspective and for additionally causing the images to appear in substantially their original or natural color.

Various other purposes and advantages will become more apparent to those skilled in the art from the following detailed description particularly when considered in connection with the duced by the camera tube will then be alter-` These video signals are then amplified and transmitted to a remotely located receiver where they y are utilized for the production of optical light images on a single iluorescent or image surface.

In order that the desired stereoscopic eiect may {5;} vFigure 5 represents schematically a television drawings wherein:

Figure 1 represents schematically a preferred form of a television transmitter incorporating the present invention;

Figure 2 shows a polarizing drum for causing 2,508,920 f 'z i i the rate that the line of demarcation between polarizing screens traverses the light responsive electrode |I corresponds substantially identical to the vertical or eld deflection rate of the scanning cathode ray beam. The drum 38 is rotated by means of motor 40 and its speed as Well as its phase relationship is maintained by equipment operating eonjnnctionfwith the camera control eircuitsll, t i

As the drum is rotated, it will be observed,

therefore that although both horizontal and verupon which is produced an electrostatic Vcharge image as a result of the projection -of-a light image upon the light responsive` electrode. Plfoper focal condition of the cathode ray beam is maintained by means of a focusing coilA I2, whichsurrounds the camera tube and which extends" throughout a major portion of its length. FQ!

deflecting the produced cathode ray beam in substantially `mutually perpendicular directions, e deiieetiile Coil i4 yifs provided. The television cameraitube le. the focusing oeil l2 end-the defleetiiieeoils i4 are- ;Sepplied with energy from various carriere. control circuits. ofknown variety, all of which-are representedschematically at it., The imagesignalsproduced by vthe television Camera tube aredireetedto thetelevision transmittereeoiiiinent t8 whiehliiioreases the intensity of tlie iliiaeeeieneis andewhioh mixes Withfthe image signale rieeessarysynohronlzies Sienalatlaliking.igllalsnaild-doiiorth that areneces sary;ior su tultransmiesien and reception oiztlie televleioniniasesalliesesienals are then tra risrilitteiil preietablyiloy meansfof a radio fr efluency carrier. in order thattliey maybe vreceived by a remotely. located :television receiver- A-ssooiated with the television camera tube einy optical System including lellSeSv 28 for focusing images of Vthe vsubi ect matter 4to Vbe vtransmitted upon-the vlight responsiveelectrode surface H. Positioned immediately' in yfront of the lenses 20 is afhalf sil-vered mirrortZAfand in front of this mirror is areflecting surface 126. Additional-reecting surfaces 28 and 30 are also provided. A

pair of stationarypolarizing screens 32 and `34' .are

also employed. and the planes of polarization. of thesetwo Y screens are arranged iat' right angles or normal to each other. 11n-explaining the opera.- tion ofthe present-invention, itwill be assumed thatithepolarizingscreen a3-2 iisso oriented as to transmit only :vertically polarized light While Situated between the lens system 2t and the television camera vtube is a stationary reflecting surface 36 and a rotating drum `38. 'The drum 28 le shown Someuliatin detail in Figure 2 and iriolildes a plurality of Apolarizing titers. Each successive polarizing,screenhasits planeof polarization normal to' each `adj acent polarizingscreen. The peripllelal extent o feach polarizing screen is,substantiallydentieal to the desiree oi Vertical defiection of the cathode ray beam, and thespeed ofrotatiori of the drum is preferably such that leidige iiiwliidlifiS-L ietatealer:ineens diameter;

ticalpglarized images are present at the reflected surface l36, these images are separated by the polarizing drgmsofthat the light responsive sur- .iaQeLl Lszexnosedto an image transmitted along the one or the other of the two light paths L or E individuallyLandvsuccessively. If, for example, a vertical polarized portion of the polarizing drum isrlmmediately opposite the light responsive electrode surface I I, then only an image transmitted a1eaatlieeeteal liebt.,eatliihthroiieh;Stationary polarizing .screen 3 2 `,will be projected :upon the light l1 resineliieive .electrode Surface. The horizoritallr polarized image transmitted alone optical lie tsatliR., `Lnotrassftlirouehtheyerticaliy polalizedrortion ofthe drumleeeordiriely, as the drum ismtatedimasesareseauentiallyrroiected runen the, light responsive surface corresponding te-.sueoe ireyiewsefthe object area alone the indesiderate;Eslitlnatlisnand R.

-f lltie areierable that theeeannina operationtake place ,inthe lm inediateevieinity .e f, or dir ect1y iin der, the line of demarcation between the eid-- leeentlpolarizingnertionszoz eeeticnsof the polar.- iznefdriim. Such a itechnigueiis shown, and de Seriloesl, fonexaniple milj. S.;.PatentNo. 2,458,64 9, issued ftottc Schade en .January 11, ,1949. When such Vva .technique iis 1employed, television image :signals willbe produced corresponding to the irnageilast projectedlupon thezlight responsive electrodeaand :that image .will-have Iarrived at the;televisionfcamera'tube :along -the one or -the other ofitheltwo paths.

orderithat. exact focal; conditions Yof Athe optical ilight-image .maybe maintained, even `.at short operating distances, itis preferable that theztwo lightfpathsbe identical in length, and with thevarrangement above described-andshown in :Figure ;1, V.the optical. distance from an object ytolse televised rto thezlenssystemZ-and the light responsivesurface il-l ls'the same y'foreach light path. 1

With the system-a5 above described, it is -ob vicus -that ytelevision rimagesig-nels -will be -produced in. which alternategelds IWill -berepresenta'tive of the -object area -as it appears along one light path, #Whereas Itheremaining rfields will -be representative of the obiectas it appears along thegotherlightpath, This situation isjtrue, lf'it 15 assumed that the'peripheral extent of each individual polarizing element corresponds substantially `to thetdegree of Vertical deflection of the cathode ray'bearn inthe television camera tiibe, these signal-saire transmitted to a reeeiven which -is represented' schematically in Figure 'lzthesigiials are receivedalxinliiied and demodiilatedjbl? appropriate ,circuits contained within .the ,reeel-ver. '1.2.1 The demedulated Signals ale ,an d t'o lthe, control' electrode .of a television image producing .tube i4 in order to aiirreiitlmodulate .a cathode ray beam gener 'tedtbereiaeo'tlietiilaek.and Whiteimaees areprodiicedon the iii ying screen l oi the tube, Associated ,with .the image produeine tube is Ia azioaozo 78, at a desired speed corresponding to the speedk of the rotation of the filter drum at the transmitter and a desired phase condition is also maintained. 'Ihe drum includes alternate peripheral segments of vertically and horizontally polarized screens in order that successive field images will be polarized alternately in a vertical or horizontal direction. In order that an observer may segregate the images so that the right eye sees images transmitted along the optical light path R in Figure 1 and the left eye sees images transmitted along the optical light path L, the observer is provided with a pair of polarized glasses 8s including lenses 82 and 84. The lens 82 is polarized vertically to correspond to the polarizing screen 32 in Figure 1 While vlens 84 is horizontally polarized to correspond to the screenV 34 of Figure 1. When the drum 16 is properly phased with respect to the drum 38 at the transmitter, the left eye of the observe sees throughv vertically polarized lens 82 (and a correspond-v ingly polarized segment of the drum l) images corresponding to those transmitted only along the optical line path L oi Figure 1. Similarly, the right eye of the observer sees images transmitted along optical light path R at the transmitter. Since successive elds at the television receiver represent images transmitted alternately along the two light paths and since the field repetition rate is approximately 60 per second, each eye oi the observer sees 30 images per second representing a view of the televised subject matter taken along a particular light path. With such an arrangement stereoscopic or third dimension television pictures are produced.

The above described method of transmitting black and White stereoscopic television images might be objectionable where double interlacing is employed since the observer would always see, with a particular eye, images composed of the same lines on the screen of the receiver. In order to remove this objection, it is only necessary to make the peripheral extent of the separaten polarizing elements of the lter drum correspond to approximately twice the extent of the vertical deecticn of the cathode ray beam in the tele-v vision camera tube. When the ilter drum 38 is so modified, the line of demarcation of the polarizing segments still traverses the light respons-ive as also are the filters 44, 45, and 46.

electrode at the proper rate, but the shift as beo tween optical line paths L and R occurs at the rate of 30 times per second rather than 60. A complete frame (constituting two successive iields) would, therefore, correspond to a view along one light path, with the next frame corresponding to a view along the other light path. With such an arrangement the observer would, therefore, see with each eye a complete frame or picture including both interlaced lines and these complete frames would be observed alternately through the lenses 82 and 84. Under these conditions, the filter drum 16 at the receiver must also be modified so that each polarizing segment will be in front of the image tube for a period corresponding to two fields or one frame.

The above described method of presenting television images in perspective or third dimension can also be used in conjunction with sequential color television but under these circumstances a color iilter assembly for separating the compo-` nent colors must be used at both the transmitter and the receiver.

In the transmission of color television, it is genvideo signals representing sequentially three different component colors, namely blue, green and red: In a sequential color system, video signals are `transmitted sequentially representing the color. content of the subject matter with each successivefield representing a different component color. In order to remove or materially reduce any possible iiicker, it is generally proposed that 120 elds or vertical deiections per second will be employed. It is also proposed that adouble interlaced method of scanning be used. Under these circumstances, 120 elds are transmitted per second and three successive fields, representing all three component colors are repeated at the rate of 40 times per second. Due to the interlaced transmission and the proposed number of three component colors, the repetition rate for. the transmission of a complete color picture or image is 20 per second. In other words, 201

complete color images occur during each second, each complete colorimage including six separate color iields.

When color television images are to be presented in perspective or third dimension, a color filter disc or drum will be employed at the transmitter, incorporating the necessary blue, green and red color filters and including also horizontal and'vertically polarized screens. A development of such a drum is shown in Figure 3 and the direction of the relative motion of the drum with respect to the television camera tube is represented by the arrow associated therewith. The lter assembly shown in Figure 3 includes six color filters 4| through 46. Filters 4I, 42 and 43 are colored blue, green and red, respectively, Associated with these lters are polarizing screens and these screens may be superimposed upon the filters. Each alternate screen is polarized at 90 with respect to the remaining screens, and, as shown in Figure 3, lters 4|, 43 and 45 have associated therewith vertically polarized screens while lters 42, 44 and 46 have associated therewith horizontally polarized screens. It will beA observed that successive color lters of the same color are polarized differently so that each eye of the observer sees each individual color sequentially and each individual color is presented to each eye alternately.

In the receiver, a color and polarizing drum or similar structure is employed which includes segments having a series of color iilters and polarizing screens similar to that shown in Figure 3. The drum at the receiver, when rotated in synchronism with the filter and polarizing assembly at the transmitter and when properly phased therewith, will permit an observer, when equipped with the glasses including polarizing lenses 82 and 84, to see color television images in perspective or third dimension.

' When a television transmitter and receiver are equipped with light lters and polarizing sections such as shown in the development of Figure 3,

it is apparent, therefore, that color television images may be transmitted and may be presented transmission system (as described above in connection with Figure 2) each eye of the observer then sees onlya single group of line elements of.

each-iframe.V In: order to"` overcomezthisaobjece oir in Iame Batent Nos.- 2.2133117?r and 2,2885402 tionVit-l is? onlynecessary:l toemploys-afr illteif and mavibe used polarizing` assemblyy atllbothithei transmitter andi 'lhe'useoi a drumtype polarizing assembly isthe receiver. which has"l a:-constructionsimilarftor preferabletoa disc' type since the former insuresthatvlshown in' the development in liigurewl. In 53 that" the planel of polarization' Will not be shifted thisigul'e; theafilterandipolarizingassemblyine dur-ingY operation; If a2 disc is usedat either or.; oludesztwelve'felementsiinoiudingffdur eachzofthe.- both the transmitterand receiver,.the disc should three blue; greenz` and; red` light; lter segments: be so constructed and of suiiioient-` size that a Half. ofA the. twelve: elements are hnrizmntallyI minimum amountloff orientation of the plane ofi polarized; andi the4 otherf half? are. Veiticzallyv mi polarization occurs asrthe disc'is'rotated. Adisc polarized, but; it. willbefobserveditiiatztwoxsuccess suitable for this` pur-pose is shown-4 and; described sive: elementsearepolarized in: thesame directioninSomers=Uf Si Patent 254291849; issued on Octowherea the: next; two: successive elem-ents are berV 28; 194i?. Polari'zingf'and'llter assembliesiofl polarized im the; opposite; directions; Tha lten theendless belt-typemayalso.be1used. assembly: may'includeg fon'exaanplegclementsf 51s V115? Having-now: described; the invention, I claim: throi1gh.52;.of whichrthe elementss5l, 54;.551 and 1i Aatransmitter for transmittingft'el'evision.siglill arefblu, theE elements;52;.55;.5= andi 6l; are naisY in perspective', throughthe-cooperative use green. While; the elements.. 53; 58,'. 5.43.J and 62.*. are oiatelevisionicamera.tubehaving a light responred.. The direction thatz-therzpolarizinge screens sive imageV receiving; surfaceI the combination; are polarized arefshowninzEigureAw-ith elemente 2U; comprising: a; lenssystem: for projecting anopti` 51;,52, 55, 56,' EB-and 6H;polarized` infeavertical' oalirnageon saidrsurface;aarotatablelight polardirection and elements 53, 54, 51;. 58;,61i: and'lr iaing assembly` positioned?between the lens sys-- polarizedin a horizontahdirection. temandthe camerattube, said assembly including When such a, iilter is employed; ati both; thex as. plurality of..lightpolarizingsections, theplane transmitter:4 and,` theY receiver;J color: television: 25 oitpoiarization of each Vsection being substantiallyV images will-ibe-presented. in amannen'well known: norma-l toctiie` plane'of polariiaationfof;eachy adjatofthose:skilledin-theartandgthesaimages will.- cent-.sectioma pair ofhorizontally spaced polarappear in perspective duetothewuse;oftheipolaree izingiscreens. positioned betwe'enithe lens system;

izing screens employed. at the; transmitter` andv andian; object; area. to; bertelevised, the planes of;

receiver.. Since. signalsi are; transmitted, repre;-` polarization of; the; pairoff, screens. being. normal; senting; two.. successive' television. fields.: viewecb to@ each otherfandi corresponding individually to along`A one; optical. path followed by,v two, succesfthe planeseof .polarization `ofthe. alternate sections.- siveiields,A viewed along, the other.: optical. path; off the polarizing; assemblyg, optical means.V posi-` each eye;of ,theobserverwillfseeacomplete-frame; tionedbetweenrthe pair ofpolarizingscreens and; including two.: transmitted fields: Under these; 3:5: the lens system-,for'directingdight transmitted bv.y circumstances. and. assuming. |20.; iieldsfpensec.-A thespaccd: screens; from: an. object: area into the ond, the. repetition. rate of. a. complete cy,c1eon lensrsystemalong twolightpathspand.means to. transmission .is loper.second,yetval1.three com,Y move:thepolarizing` assembly so. thatthe alterponent colors. of. the image. are presented at; ae natelvy polarizedzstons thereof'aresequenlially rate of 40,cycles. per second. Due-tothefdouble; and progressively. interposediin the optical` pathinterlacedimethodo transmission,..one;completee between thelens system and thecamera tube to: color cycle occurs. during each 1/arof aasecond.. subject the light responsive, surface. tooptical; Because of. the pairingof the .polarizing,soreens, ,af images o1" the object area transmitted alternately complete color and stereoscopic cycleoccurs durf along the two lightpaths. ing 1710 of; a second. Inspiteof.. thisI apparenti s 2. Atelevision transmitter for transmitting tel.A lowrepetition rate,v for; a. complete color. and. "1' evisiond Signals'. in apparent third'-` dimensionA stereoscopic cycle,.verylittle iicker, is apparent, throughgthe,cooperativeuse of-.al television carnby reasonofftlie fact tliat the.iTeldrenetitionrateu eraL tube. having?, a light reSDOIlsVe. image fleCel/'f i`sl20 cycleseper second: ing, surface,y comprising. al lens systemy for. pro- Although the present invention is described iecting and focusing an-V optical image on said.. assumingliorrizontaily andvertically polarized` wsurface,.a rotatable lghtmolarizng drum posi-v gradings; any/other` directions. may as, well. be. tioned;betweenrtheflensssystem and. the camera. empioved so longas the. relative polarizedidirece tube, said. drum including a plurality of. light,

tions" of the screens are normal` to each. other.1 nOlariZng-Seto1lSfnWhihihlelphll extent? Furthermore; in theoptical'systemslicwn in Eig-,- l of..each..section .corres-ponds tothe verticaldirnen` ure3 l, provision is'rnadevvl'iereiiythe, lengths ofi my; sion of the utilized ,portionvof1 the light responsive.V theopticallliglit paths areidentical. Ifthe trans.- surface andinA which:A successive.- sections of the: mitter is tobe'usedforrelativeiylongrange world. polarizingdrumarepolarized in planes substan andvvlithA l'ovvspeed-lenses,` this .degreeofrefinetially normaltoeach other; atpairoihorizontally nient-.sisinot'necessaire` and'under. these circumspaced polarzinascreens,positionedbetween thestances, it is possible to-eliininatere`ecting surm" lens system andianiobiectarea to: be televised, facesz28-l and 3311 Wiien-thesereiiectingsurfaces the, planesoi polarization-.ofL the pair of screens areaornitted; the-half' silvered surfaceK 24 would' corresponoiing individually.- tothe planes of polarbe rotated counter;cloolwise'through96-and'tli'e izationolthe. alternate.sectionso-.the polarizing object; rath'ervthan appearingf'at thesidelof thec dium,.optical.means,positionedbetweenythe lensA televisionicameray tubel (as irrFgure 1'9, would". System and the pair of polarizing screensv for naturally-appearatthesennoftlie televisiontube" directing,v the. polarizedlight transmittedby the (toltherrightlinitheidi'awingb. spacedscreens from acommon..objectareainto..

Whileaa television earneraitube of tiie=i-tlilconthe lens system along substantially parallel and type isspeciicallv nieItdJionedf herein,- itis vto'bex equalA length liglit paths. means to rotate the understood! thatany.I oth'erftypeuofvvv camera tube'5 7m polarizing` drum. so that the successively, differcnuldfasawell beuSedi Due tothe'finherentlightY entlvpolarizedsections thereof. are sequentially lossesio; theesystem, however,l Ythe= cameraf tube and progressively-interposed'inY the optical path should: have. considerable. light: sensitivity: For'v between the lens system and the cameratube exancipleg.television?carnes-a1` tubes-saches s'liovvn'v thereby to-subjectf the' light' responsive surface andzdescribedzimlamsietah .BatentNo-i :213,175T5 'lli toeoptical'- images of the'obj ect area transmitted' v.alternately along the two light paths to'produce corresponding electrostatic charge images, and means to convert the charge images into a series of television video signals.

3. A transmitter for transmitting television signals in perspective including the use of a, television camera tube having a light responsive image receiving surface, comprising in combination a lens system for projecting an optical image onto said surface, a rotatable light polarizing drum positioned between the lens system and the camera tube, said drum including a, plurality of polarizing sections in which successivesections are polarized in directions substantially normal to each other and in which the peripheral extent of each section corresponds substantially to twice the eiTective vertical dimension of the utilized portion of the light responsive surface, a pair of stationary horizontally spaced polarizing'screens positioned between the lens system and .the object area to be televised, the planes of polarization of the pair of screens being substantially normal to each other and corresponding to the planes of polarization of the successive sections of the polarizing drum, optical means positioned between the lens system and the pair oi polarizing screens for directing light transmitted by the spaced screens from the object area into the common lens system, means to rotate the polarizing drum so that the alternately polarized sections thereof are sequentially introduced into the optical light path between the lens system and the camera tube to alternately `subject the light responsive surface of the camera tube to optical light images transmitted along the one or the other of the two light paths alternately, and means to convert the optical images into a series of television signals in synchronism with the rotation of the polarizing drum.

4. A transmitter for transmitting color television signals in perspective including the use of a television camera tube having a light responsive image receiving surface, comprising a lens system for projecting an optical image onto said surface, a rotatable light polarizing and light lter assembly positioned between the lens system and the camera tube, said assembly including a plurality of alternately polarized sections in which the planes of polarizationof adjacent sections are substantially normal to each other, and in which successive sections of the assembly contain differently colored filters in accordance with the component colors into which the object area is to be segregated, a pair of horizontally spaced polarizing screens positioned between the lens system and the object area to be televised, the planes of polarization of the pair of screens being normal to each other and corresponding individually to the planes of polarization of the alternate sections of the polarizing and filter assembly, optical means positioned between the pair of polarizing screens and the lens system for directing light transmitted by the spaced screens from the object area into the lens system along two light paths, means to move the polarizing and lter assembly so that successive images projected on the light responsive surface of the television camera tube represent sequentially the color content of the different component colors of the object area and so that the successive images are directed on the light lresponsive surface along the two light paths alternately, and means to convert the optical images into a series of video signals.

5. A transmitter for transmitting color television signals in apparent third dimension through the cooperative use of a television camera tube having ra light responsive image receiving surface, comprising a lens system for projecting an optical image on said surface, a rotatable polarizing and lter drum positioned between the lens system and the camera tube, said drum including a plurality of sections each of which is provided with a successively differently colored light filter and in which successive sections are polarized in planes substantially normal to each other, a pair of horizontally spaced polarizing screens positioned between the lens system and the object to be televised, the planesof polarization of the pair of screens being normal toeach other and corresponding to the planes of polarization of the successive sections of the polarizing and'filter drum, optical means positioned between the polarizing screens and the common lens system for combining the light transmitted along each path and for directing the light into the lens system, means to rotate the drum so that the 'light responsive surface of the camera tubehas pro'- jected thereon differently colored light images representing the different component colors of the object area and so that each successive image corresponds alternately to light transmitted along the two light paths, means to convert the light images into a series of television video signals in synchronism with the rotation of the polarizing and lter drum, and means to transmit the series of video signals to a remotely located receiver.

6. A transmitter for transmitting color television signals in apparent third dimension wherein is used a television camera tube having a light responsive image receiving surface, comprising a lens system for projecting an optical image on said surface, a 'rotatable polarizing and filter drum positioned between the lens system and the camera tube, said drum including a plurality of sections each of which is provided with a successively differently colored light filter and in which successive pairs of sections are polarized in planes substantially normal to each other, a pair of horizontally spaced polarizing screens positioned between the lens system and the object to be televised, the planes of polarization of the pair of screens being normal to each other and corresponding to the planes of polarization of the successive pairs of sections of the polarizing and lter drum, optical means positioned between the polarizing screens and the lens system for combining the light transmitted along each path and for directing the light into the lens system, means to rotate the drum so that the light responsive surface of the camera tube has projected thereon differently colored light images representing the different component colors of the object area and so that each successive pair of images results from light transmitted along a different one of the two light paths, means to convert the light images into a series of television video signals in synchronism with the rotation of the polarizing and filter drum, and means to transmit the series of video signals to a remotely located receiver.

7. A television receiver for receiving color television video signals representing different component colors of an object area and representing a perspective of an object area in which the signals correspond to yimages of the object area transmitted alternately along substantially parallel horizontally spaced optical Alight paths, comprising a receiving system, an image producing tube including the viewing screen, means including said receiving system for producing optical images at the viewing screen in response @ammo 11 .to .the areceived ,video signals, a rotatable polarcorresponng "to .the component .colors repreosentedhythe leceiwed .vdeosgnalsgandn .which .successive Jefcljenoen::patins of the sections :are .prowlle mthlghtspolaiz'ngsoreens, :theeplanesof polarization of ithe :successive ,pairs .be'ng sub'- VJiiisantally .norml `dto :each other, means n.to votate lthe,pola.r.izing.and.1ter Vassembly at .a ratosuch lthat polarizing seotonshavng A.the same mlaneof L pcilmtization are ectvely in positioninrontxo "the v'evng screen .at iritextvals .when signals ane Y.

.received eornespondng to .animage `of `the.ob1eot; .area '.i'ransmiitelilongjaJ pdetermined path, lthe .olor Llter ,provided lin `the successive t'sections simultaneously .imparting .a .desired .color tone kto thepro'cluoed'lmages and. a palnof .viewmgfglassos atapte tolbe wom by anobseltvensaidlasses .inclullngtwol-.polarizedlenses:havngthelrmlanes i12 opolarizationlsubstantallynormalltofeaxxhther :and cornespondingito.theplanesinvwhichethe.pro- -lduceddmagesare .polarizedby the polarizingand `filter assembly, whereby .the olor :television .images .appear Ain perspective to .theobsexfven BAYD. KELL.

`REFERENCES @CITED following :references iaf're Iof reoord Vin the file -0f @this mutant:

lNuniber iName .Date

2,301,254 Camhan NOM. 1Q, 19,442

1?;31333113 Dysr .May25 19.43

23842.60 .Goldsmith Sept. i, 19.4.5

2,429,849 Somers .0111;I .28, 1947 ylOREIGlT PATENTS -0 Z'Number "Couritry 'Date z552,582 Great Britain Apr. '15 1943 

